The extra SES crews will also be on hand to deal with swift-water rescues, and then rapid damage assessments after the flood has hit.

One of Rockhampton's biggest employers, Teys Australia, which operates the city's meatworks, has closed its plant in the face of the flood threat. Teys hopes to resume processing at the plant on Friday, but warned the closure may go beyond then, depending on water levels.

"While cattle have been purchased to supply the plant for the week, the safety and wellbeing of staff is our priority. On that note we urge employees to follow the instructions of local authorities and do what is necessary to stay out of danger," the company said in a statement on Monday.

Meanwhile, Queensland State Disaster Coordinator Steve Gollschewski said authorities were conducting "exhaustive" searches for three men still missing across the state.

It comes after the body of 77-year-old Nelson Raebel was found in floodwaters in Logan on Saturday.

QUEENSLAND RECOVERY IN NUMBERS:

- About 1600 without power in southeast

- About 21,000 without power in north

- 300 schools need repairs

- 588 residences deemed uninhabitable in central and north

- 76 residences deemed uninhabitable in the southeast, likely to go up by 250-300 in coming days